| Basics | RF Spectrum | Radio Waves | Amplitude Modulation | Transmitter/Transistors |
|---|---|---|---|---|
|
What are the transmitter, transmitting medium, and the transceiver
These are the three essential elements of telecommunications
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What is ELF (up to 300Hz)
One way communication to submarines
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What is signal propagation
Radio signal getting from transmitting antenna to receiver's antenna
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What is modulation
process of combining RF and AF signals
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What is a Harmonic
Exact multiple of the fundamental frequency (even and odd)
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What is to transfer information almost instantaneously from one point to another
The purpose of telecommunications
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What is EHF
Used for experimental purposes
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What are Reflection, Refraction, and Diffraction
Effects of Environment on Wave Propagation
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What is Heterodyning
Combining/Mixing two frequencies so that four output frequencies are produced
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What is SubHarmonic
Exact submultiple of the fundamental frequency (1/2, 1/4)
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What is 30kHz-300GHz (Radio) and 20Hz-20KHz (Audio)
These are the radio and audio frequency ranges
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What is UHF (300MHz-3GHz)
Most dependable short-range tactical communcation
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What are the types of Space Wave Propagation
Direct Wave, Ground Reflected, and Sky Waves
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What are Frequency SIdebands
Band of frequencies higher/lower than carrier frequency
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What is suppression
Elimination of undesired portion of a signal
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What is any frequency that can be modulated to carry intelligence (speech, music, images, or signals)
The carrier frequency
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What makes up UHF, SHF, and EHF
Microwave Range (?)
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What is radio frequency interference
RFI
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What are the three things needed to modulate a signal
Amplitude, Frequency, Phase
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What is continuous wave
First type of Radio Communication
|
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What is the intelligence signal used to modulate the carrier frequency
The modulating signal
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What is MF (300KHz-3MHz)
Search and Rescue Operations
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What is electromagnetic interference
EMI
|
What are
1. System Recognition 2. Symptom Elaboration 3. Listing of probable faulty functions 4. Localizing the faulty function 5. Localizing the fault to a defective circuit 6. Failure Analysis
Six steps to troubleshoot
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